The 26-year-old founder of the blogging giant—now reportedly being acquired for $1.1 billion by Yahoo—couldn't figure out how to sustain its experimental journalism project. Here's Karp on Tumblr's future from our recent Innovation Uncensored conference.

Reddit cofounder Alexis Ohanian debated USC professor Jonathan Taplin, director of the USC Annenberg Innovation Lab and former tour manager of The Band at our recent Innovation Uncensored event. Afterward, Ohanian continued the debate with an open letter to Taplin. The next day, The Band's drummer Levon Helm died—and inspired this rebuttal from Taplin.

At Fast Company's Innovation Uncensored conference, things got heated between Reddit and Y Combinator's Alexis Ohanian and USC professor Jonathan Taplin, director of the Annenberg Innovation Lab, former tour manager of The Band, and friend of its drummer Levon Helm, who died the day after this debate.

Sarah Robb O'Hagan, Gatorade president, North America, and global chief marketing officer, sports nutrition, for PepsiCo, talks with Fast Company about how an active imagination can help drive business growth.